STARFISH DISSECTION

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Presentation transcript:

STARFISH DISSECTION

Kidspiration by Riedell

SYMMETRY ADULTS- Radial LARVA- Bilateral

STARFISH LATIN meaning KINGDOM _____________ PHYLUM _____________________________ CLASS _______________________________ ANIMALIA ECHINODERMATA “spiny skin ” ASTEROIDEA “star-like”

SPINY SKIN SPINES for protection connect to ENDOSKELETON inside underneath skin

OSSICLES Calcium carbonate plates form endoskeleton inside

SPINES PEDICELLARIA SKIN GILLS Image by Riedell

PEDICELLARIAE (sing. Pedicellaria) Keep surface clear of organisms

SKIN GILLS Hollow skin tubes that project from skin for increased surface area connect to coelom inside Image by Riedell

Skin gills between spines EXCHANGE GASES and EXCRETE NITROGEN WASTE

TUBE FEET surfaces

EYESPOTS Sense light/dark

ORAL VIEW

Opening to water vascular system Madreporite

WATER VASCULAR SYSTEM BIODIDAC

AMBULACRAL GROOVE TUBE FEET sit in GROOVE

TUBE FEET Used for feeding & locomotion

Dissection Steps 1.Begin cutting down the central part of ray 1.Identify Digestive Glands 2.Identify connection of digestive glands to the pyloric stomach 2.Investigate stomach 1.Find Pyloric and Cardiac Stomachs 2.Find where Pyloric Stomach connects to digestive glands and anus 3.Find stone canal and Madroporite 1.Examine Tube Feet, Gonads, Radial & Ring Cannals, Ampullae

Begin to cut down central part of ray

DIGESTIVE GLAND Makes BILE ABSORBS NUTRIENTS

2 part STOMACH

DIGESTIVE SYSTEM DIGESTIVE GLANDS DIGESTIVE GLANDS MOUTH ANUS

CARDIAC stomach connects to mouth (extruded during feeding) PYLORIC stomach connects to digestive glands and ANUS

AMBULACRAL RIDGE covered by OSSICLES contains RADIAL NERVE (nervous) RADIAL CANAL (water vascular system)

AMBULACRAL RIDGE AMPULLAE (tops of tube feet)

OSSICLES Calcium carbonate plates form endoskeleton inside

GONADS

NERVOUS SYSTEM NERVE RING encircles mouth RADIAL NERVES run inside AMBULACRAL RIDGE in each arm

SEPARATE SEXES GONADS- reproductive organs Starfish have both SEXUAL ASEXUAL (Regeneration)

DIGESTIVE GLAND GONAD OSSICLES

LARVA FERTILIZATION EXTERNAL INDIRECT Has BILATERAL SYMMETRY and wings to swim BIPINNARIA DEVELOPMENT SEXUAL REPRODUCTION